package com.lzh.java;
//static 关键字的应用
public class CircleTest {
	
	public static void main(String[] args) {
		Circle c1 = new Circle();
		Circle c2 = new Circle();
		Circle c3 = new Circle(3.4);
		
		System.out.println("c1的id："+c1.getId());
		System.out.println("c2的id："+c2.getId());
		System.out.println("c3的id："+c3.getId());
		System.out.println("创建的圆的个数为："+ Circle.getTotal());
	}
	
	
}
class Circle{
	
	private double radius;
	private int id;//自动生成
	
	private static int total;//记录创建圆的个数
	private static int init = 1001;//static声明的属性被所有对象所共享
	
	public Circle(){
		id = init++;
		total++;
	}
	
	public Circle(double radius) {
		this();
		this.radius = radius;
//		id = init++;
//		total++;
	}
	
	
	public double getRadius() {
		return radius;
	}

	public void setRadius(double radius) {
		this.radius = radius;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public static int getTotal() {
		return total;
	}

	public static void setTotal(int total) {
		Circle.total = total;
	}

	public double findArea() {
		return 3.14 * radius * radius;
	}
	
}